<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        /*
        块级元素特点：可以设置宽高, 独占一行, 默认和父级元素等宽
         */
        div{
            width: 300px;
            height: 300px;
            background-color: pink;
        }
    </style>
</head>
<body>
<div>11111</div>
<div>22222</div>
</body>
</html>